var downLoad = function (imgArray) {
	this.arr = [];
	this.imgCount = 0;
	this.imgArray = imgArray;
	this.imgLength = imgArray.length;
	this.transfer = 0;
}
downLoad.prototype.getImg = function () {
	if (this.imgArray) {
		var imgArray = this.imgArray;
		for (var i = 0; i < imgArray.length; i++) {
			var src = imgArray[i].src;
			imgArray[i].setAttribute('crossOrigin', 'anonymous');
			this.requestImg(imgArray[i], src);
		}
	}
}
downLoad.prototype.requestImg = function (img, src) {
	var _this = this
	var src = src;
	img.src = src;
	img.onerror = function () {
		var timeStamp = +new Date();
		_this.requestImg(img, src + '?' + timeStamp);
	}
	img.onload = function () {
		_this.imgCount++;
	}
}
downLoad.prototype.getBase64Image = function (image, ext) {
	var canvas = document.createElement("canvas");
	canvas.width = image.width;
	canvas.height = image.height;
	var context = canvas.getContext("2d");
	context.drawImage(image, 0, 0, image.width, image.height);

	// 这里是不支持跨域的
	var base64 = canvas.toDataURL("image/" + ext);
	return base64;
}
downLoad.prototype.init = function (dom, target, fileName, paperSize) {
	var _this = this;
	var targetId = targetId || 'content';
	var fileName = fileName || 'content';
	var paperSize = paperSize || 'a4';
	this.getImg();
	dom.onclick = function () {
		document.body.scrollTop = document.body.scrollHeight - screen.height;
		document.body.scrollTop = 0;
		try {
			//这里可以隐藏页面多余的内容
			//$('.test-lists').find('.test-lists-bottom,.test-lists-sy,.test-lists-xy,.test-lists-score,.test-lists-remove').hide();
		} catch (e) {
			console.log('不是内容');
		}
		target.style.background = 'white';
		if (_this.imgCount == _this.imgArray.length) {
			if (_this.transfer == 0) {
				for (var i = 0; i < _this.imgArray.length; i++) {
					_this.arr.push(_this.getBase64Image(_this.imgArray[i], 'png'))
				}
				for (var i = 0; i < _this.arr.length; i++) {
					_this.imgArray[i].src = _this.arr[i];
				}
				_this.transfer = 1;
			}
			renderPDF(target, fileName, paperSize, function () {
				_this.arr = [];
				try {
					//转换成功后还原隐藏的内容
					//$('.test-lists').find('.test-lists-bottom,.test-lists-sy,.test-lists-xy,.test-lists-score,.test-lists-remove').show();
				} catch (e) {
					console.log('不是内容');
				}
			});
		}
	}
}
downLoad.downpdf = function (target, fileName, paperSize) {
	var _this = this;
	var targetId = targetId || 'content';
	var fileName = fileName || 'content';
	var paperSize = paperSize || 'a4';
	//this.getImg();
	document.body.scrollTop = document.body.scrollHeight - screen.height;
	document.body.scrollTop = 0;
	try {
		//这里可以隐藏页面多余的内容
		//$('.test-lists').find('.test-lists-bottom,.test-lists-sy,.test-lists-xy,.test-lists-score,.test-lists-remove').hide();
	} catch (e) {
		console.log('不是内容');
	}
	target.style.background = 'white';
	if (_this.imgCount) {
		if (_this.imgCount == _this.imgArray.length && _this.transfer == 0) {
			for (var i = 0; i < _this.imgArray.length; i++) {
				_this.arr.push(_this.getBase64Image(_this.imgArray[i], 'png'))
			}
			for (var i = 0; i < _this.arr.length; i++) {
				_this.imgArray[i].src = _this.arr[i];
			}
			_this.transfer = 1;
		}
	}
	renderPDF(target, fileName, paperSize, function () {
		_this.arr = [];
		try {
			//转换成功后还原隐藏的内容
			//$('.test-lists').find('.test-lists-bottom,.test-lists-sy,.test-lists-xy,.test-lists-score,.test-lists-remove').show();
		} catch (e) {
			console.log('不是内容');
		}
	});
}